Materials Literature
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Host lattice dependences of luminescence spectra and relaxation properties of T b 3+ are described. Reduced matrix elements relevant to the transitions are calculated and compared with observations. The spectra and the decay times of the 5 D 4 → 7 F J transitions are in qualitative agreement with the calculations. The…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray photoelectron spectrometry of platinum compoundsW. M. RiggsCite this: Anal. Chem. 1972, 44, 4, 830–832Publication Date (Print):April 1, 1972Publication History Published online1 May 2002Published inissue 1 April 1972https://doi.org/10.1021/ac60312a041RIGHTS & PERMISSIO…
Ordered phases in the Co-Pd alloy system are studied by electron diffraction, using evaporated single crystal films of the alloys with Pd content extending from 20 to 100 at.%. Two types of the ordered states are found in this system; one is the Ll 2 type (Cu 3 Au type) and exists over the range of composition of Pd b…
Magnetic susceptibility results and extensive electronic, infrared, and Mi:issbauer spectral data are presented for enH_2[(FeHEDT A)_2O]· 6H_2O_3, Na_4[(FeEDTA)_2O]· 12H_2O, FeHEDTA· H_2O, and NaFeEDT A· 3H_2O (HEDTA = N-hydroxoethylethylenediaminetriacetate, EDTA = ethylenediaminetetraacetate, and enH_2^(2+) = \n…
Chloride bearing solutions were equilibrated with partially melted silicate rocks under two to eight kilobars fluid pressure, near the 700 degrees and 750 degrees C isotherms. Glasses, ranging in composition from granite to granodiorite and trondhjemite, were separated from the charges and were analyzed colorimetrical…
Photoemission properties were measured for the materials gold, aluminium, stainless steel, vitreous carbon, Aquadag, graphite, silica, and semiconducting indium oxide. The surfaces were treated so as to simulate the conditions actually encountered in space missions. Results are presented on the reflectance, photoyield…
Helium injected into tungsten has been found to undergo rapid interstitial diffusion at room temperature unless it encounters lattice defects. This effect has been used in a study of the lattice damage produced near a (100) tungsten surface by the impact of small numbers of 5 keV heavy ions. The helium, injected as 25…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPrecision neutron diffraction structure determination of protein and nucleic acid components. I. Crystal and molecular structure of the amino acid L-alanineM. S. Lehmann, T. F. Koetzle, and W. C. HamiltonCite this: J. Am. Chem. Soc. 1972, 94, 8, 2657–2660Publication Date (Pr…
A review is presented of the direct numerical approach to the study of the atomic vibrational properties of disordered systems. The basis and details of the numerical methods employed are first described. This is followed by a review of applications of the approach to two-component disordered lattices, glasses, mixed-…
The annual meetings of Commission XIV were held on the occasion of the Annual Assembly of the International Institute of Welding in Lausanne from 16 to 19 July 1970. They were attended by 43 delegates, experts, observers and temporary experts from 20 different countries. Two countries tied for top honours in represent…
Single crystals of magnesium containing varying amounts of In, Al, Pb and Bi in solid solution have been deformed in tension over a range of temperature between 4.2°k and 500°k. The critical resolved shear stress (CRSS) for basal slip has been examined in the light of the existing solution hardening theories. The earl…
Abstract A method to prepare thermally stable resin fiber‐reinforced composites using solutions of appropriate monomers is described. Solutions containing a dimethyl ester of an aryl tetracarboxylic acid, the monomethyl ester of 5‐norbornene‐2,3‐dicarboxylic acid and an aryl diamine were used to impregnate graphite fi…
The temperature-composition phase diagram of ${\mathrm{V}}_{1\ensuremath{-}x}{\mathrm{Cr}}_{x}{\mathrm{O}}_{2}$ with $0\ensuremath{\le}x\ensuremath{\le}0.025$ is found to contain four phases: rutile ($R$), normal monoclinic V${\mathrm{O}}_{2}$ (${M}_{1}$), and two monoclinic phases (${M}_{2}$ and ${M}_{3}$). For ${M}_…
Static and dynamic pore-collapse relations for ductile porous materials are obtained by analysis of the collapse of a hollow sphere of incompressible elastic-plastic material, with appropriate pore radius and over-all porosity. There are three phases of the pore-collapse process: an initial phase, a transitional elast…
Abstract Investigations concerning selective sorption and fixation of K and similar cations by clay minerals and soil clays and the mechanisms of these reactions are reviewed. In particular, recent observations on selective sorption of these ions in dilute solutions by weathered micas and vermiculite in relation to th…
This is the abridged version of a comprehensive volume on the thermal conductivity of the elements. It contains recommended reference values resulting from critical evaluation, analysis, and synthesis of all the available data. It also gives estimated values for those elements for which no thermal conductivity data ar…
A theory is developed to predict the interfacial properties between two immiscible polymers. A self-consistent-field approach is employed to describe the configurational statistics of polymer molecules in the interfacial region. The density profiles and surface tension are calculated, and compare well with experiments…
A 4×4-matrix technique was recently introduced by Teitler and Henvis for finding propagation and reflection by stratified anisotropic media. It is more general than the 2×2-matrix technique developed by Jones and by Abelès and is applicable to problems involving media of low optical symmetry. A little later, we develo…
We have made sound-velocity measurements in the liquid crystal $p$-methoxy-benzylidine, $p\ensuremath{-}n$-butyl-aniline. Near the nematic-isotropic phase transition we observe a dispersion in the sound velocity. Quantitative measurements are presented on the sound-velocity anisotropy in an oriented liquid crystal.
Unlike prior attempts to describe the motion of electronic charge carriers in disordered materials, we suggest that the (holelike) charge carriers may actually be selftrapped, i.e., small polarons. In support of our hypothesis, we discuss our measurements of the electrical conductivity, thermoelectric power, and Hall…